Bicycle dynamo with signal lamp



Aug. 6, 1940. R -r I 2,210,369

BICYCLE DYNAMO WITH SIGNAL LAMP Filed Oct. 26, 1937 Patented Aug. 6, 1940 UNITED STATES BTICYCLE DYNAMO WITH SIGNAL LAMP Richard Herbst, Freiburg in Breisgau, Germany, assignor to Gottlob Widmann K.-G. Elektro und Radicfabrik, Schwenningen, Germany, a joint-stock company of Germany Applicaticn October 26, 1937, Serial No. 171,171 In Germany October 26, 1936 3 Claims. (Cl. 240-75) The invention relates to an illumination device for bicycles in which the source of light is combined with the curren generator. It is characterised thereby that the casing of the current 5 generator forms, owing to the arrangement of apertures covered with transparent material, such as Celluloid, glass or the like, at the same time, the lantern casing for the source of light, the incandescent bulb being arranged in this 10 casing so that the light rays from the bulb can uniformly radiate from the casing at the same time towards almost all sides.

In bicycle illuminations of this type the advantage is obtained that the signaling light is 15 not'only radiated as up to the present in one direction, for instance in the forward direction, but that the light rays are'well visible also from the sides and partly from the rear. As' in the construction according to the invention a separate lantern casing is not necessary, the costs of production are considerably reduced, the bulb itself being better protected against damaging than hitherto.

An embodiment of the invention is illustrated, by way of example in the accompanying drawing in which the simplest form with one single window is shown in side elevation and crosssection respectively in Figs. 1 and 2.

Fig.3 shows in side elevation a casing of the second form of construction.

Fig. 4 is a cross-section through Fig. 3.

Fig. 5 is a side elevation of the third form of construction.

Fig. 6 is a top plan view of Fig. 5.

Fig. '7 shows a fourth modification of the lantern casing.

As shown in Figs. 1 and 2, the single aperture -c of the lantern casing extends over at least half of the circumference of the casing the bulb bof the incandescent lamp being arranged in the inner space a of the casing f eccentrically to the central axis of the casing f as can be seen in Fig. 2. To avoid interference with the internal parts of the generator, the lamp 1) may be mounted in the casing f at the lower end thereof, the casing being of a length whereby the armature and field parts of the generator are arranged in the casing above the lamp.

The casing f is according to the modification 50 illustrated in Figs. 3 and 4 of unround crosssection tapering towards one side, in order to obtain a better possibility of accommodation of the lamp bulb .b and further to obtain an enlargement of the effective light cone in lateral and rearward direction.

The tapering portion in which the bulb b is mounted is made of transparent material.

The same eifect relative to the light effect to wards all sides with the exception of the direction towards the dynamo is obtained in still another manner in the third form of construction illustrated in Figs. and 6, and thereby that the whole portion of the lantern designed for radiating light and consequently made of transparent material projects from the dynamo frame in such a manner that lighting surfaces are formed towards all sides with the exception of the rear side so that they can be easily perceived in traffic.

In this form of construction the signaling effect is considerably increased, as the light can T apertures are closed for instance by flexible plates 0 of synthetic thermoplastic material or similar suitable material.

The lantern casing cl serving for the accommodation of the incandescent bulb b is in this form of construction mounted on the dynamo casing f. The lantern casing may further, as shown in Fig. '7, instead of projecting in lateral direction, project in the form of a semisphere, in which the bulb is mounted, so that also in this instance the light is projected towards all sides except in an upward direction.

I claim:

1. A bicycle dynamo with signal lamp comprising in combination a, dynamo casing having an aperture extending around part of its periphery, a sheet of transparent material covering said aperture, and a source of light arranged eccentrically in said casing radially displaced in outward direction, towards the middle of said aperture and adapted to project a continuous beam 'of light directly through said aperture from at least two thirds of the periphery of said source of light.

2. A bicycle dynamo with signal lamp as specified in claim 1, in which the periphery of the easing has .a protrusionat the portion in which the aperture is formed, and the source of light is located in this protrusion.

3. A bicycle dynamo with signal lamp as specified in claim 1, in which the casing is of cylindrical shape, the source of light is mounted on the periphery of said casing, and a cap of transparent material is mounted on and protrudes from the periphery of said casing and surrounds said source of light.

RICHARD HERBST. 

